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Power source apparatus of device using electric arc

A power supply device, technology using arc, applied in arc welding equipment, conversion equipment with intermediate conversion to AC, irreversible conversion of AC power input into DC power output, etc.

Inactive Publication Date: 2002-06-12
SANSHA ELECTRIC MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, general-purpose IGBTs as used in converters 30 and 40 cannot be used as IGBT12

Method used

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  • Power source apparatus of device using electric arc
  • Power source apparatus of device using electric arc
  • Power source apparatus of device using electric arc

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Embodiment Construction

[0031] Detailed description of the preferred embodiment

[0032]A power supply device according to an embodiment of the present invention can be used for an arc welder, for example. As shown in Figure 2, the power supply unit has power input terminals 101a, 101b and 101c adapted to be connected to one of first and second sets of commercial AC power sources. The first group of commercial AC power sources consists of a number of three-phase AC power sources delivering, for example, 380 volts, 400 volts, 415 volts, 440 volts and 460 volts respectively. The second group of commercial AC power sources consists of a number of three-phase AC power sources delivering, for example, 200 volts, 208 volts, 230 volts and 240 volts respectively. Generally, the amplitude of the output voltage provided by the first set of AC power sources is about twice the amplitude of the output voltage provided by the second set of AC power sources.

[0033] The commercial AC power applied to the input t...

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Abstract

One of commercial AC voltages is coupled to power supply terminals from one of commercial AC power supplies. The AC power supplies belong to either a first group providing higher voltages or a second group providing lower voltages. A rectifier rectifies the AC voltage applied to the power supply terminals, and a rectified voltage is developed between two rectifier output terminals. A switching unit operates to connect voltage-boosting converters selectively in series and in parallel between the rectifier output terminals. Inverters are connected in the output sides of and in association with the respective voltage-boosting converters for converting DC voltages from the associated voltage-boosting converters to high-frequency voltages. The high-frequency voltages are voltage-transformed by associated voltage-transformers, and the voltage-transformed high-frequency voltages are converted into a DC voltage by a rectifier circuit and a reactor. The DC voltage is developed between output terminals of the apparatus. A switching control unit controls the switching unit so as to connect the voltage-boosting converters in series between the rectifier output terminals when a commercial AC power supply of the first group is connected to the power supply terminals, while connecting the voltage-boosting converters in parallel between the rectifier output terminals when a commercial AC power supply of the second group is connected to the power supply terminals.

Description

technical field [0001] This invention relates to power supply units for arc-applying apparatus such as DC arc welders, DC arc cutters and discharge tube ignition devices, and more particularly to apparatus capable of being operated from one of many different values ​​of AC voltage sources. Background technique [0002] Power supply units for devices employing electric arcs sometimes require the application of high-voltage commercial AC power supplies delivering voltages such as about 400 volts or low-voltage commercial AC power supplies delivering voltages such as about 200 volts. [0003] There are many low voltage commercial AC power supplies that provide output voltages such as 200 volts, 208 volts, 230 volts and 240 volts. In addition, there are many high voltage commercial AC power supplies that provide output voltages such as 380 volts, 400 volts, 415 volts, 440 volts and 460 volts. Where high-voltage commercial AC power is used and where low-voltage commercial AC pow...

Claims

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Application Information

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IPC IPC(8): B23K9/073B23K9/10H02M7/21H02M9/00
CPCB23K9/1056H02M7/21
Inventor 森口晴雄池田哲朗石井秀雄
Owner SANSHA ELECTRIC MFG
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